COSIC

04/05/2026

Newly appointed COSIC professor Yunwen Liu gave her inaugural lecture today on “Security and Privacy Challenges in Distributed Ledger Technologies.”
We’re delighted to officially welcome Yunwen to the COSIC team!
ESAT - Elektrotechniek
Prof. Vincent Rijmen

19/04/2026

Geslaagde cursus lineaire cryptanalyse. De nieuwe generatie wordt klaargestoomd.😉

“Successful course on linear cryptanalysis. The new generation is being prepared. 😉


COSIC ESAT - Elektrotechniek KU Leuven Institutt for informatikk ved Universitetet i Bergen Universitetet i Bergen

16/04/2026

Proficiat aan mijn doctoraatsstudente Betül Askin Özdemir, kersverse doctor in de cryptografie 🎉🎉🎉🎉

Congratulations to my PhD student Betül Askin Özdemir, newly minted doctor in cryptography 🎉🎉🎉


COSIC ESAT - Elektrotechniek KU Leuven

19/03/2026

New COSIC research reveals major security weaknesses in ’s , the global standard for detecting Child Sexual Abuse Material ( ). For the first time, the algorithm is fully described and its vulnerabilities exposed.
➡️ https://www.pseudodna.eu/

The team shows that can leak partial visual information, be bypassed through minimal image changes, trigger false positives, and even produce identical hashes for different images. These attacks run in seconds on a standard laptop.
Article in newspaper Het Belang van Limburg:
https://www.hbvl.be/binnenland/leuvense-onderzoekers-kraken-tool-van-microsoft-om-kinderpornografie-op-te-sporen-risico-op-valse-beschuldigingen/143009785.html [paywall]

As debates on large‑scale client‑side scanning ( ) continue in the EU, these results highlight the risks of fragile detection systems. COSIC calls for more robust, transparent, and targeted approaches to protect CSAM victims.
Full paper: https://eprint.iacr.org/2026/486

19/03/2026

18/03/2026

Fijne Pi - dag 🍾
Happy pi - Day 🍾

ESAT - Elektrotechniek KU Leuven Institutt for informatikk ved Universitetet i Bergen Gemeente Lubbeek

26/02/2026

Great news, the COSIC Seminar on "Revisiting (Standard, Rotational, Internal) Differential-Linear Cryptanalysis via a Walsh-Transform Perspective" by Jiahui He (COSIC) is now available on our YouTube channel:

COSIC Seminar - Revisiting (Standard, Rotational, Internal) Differential-Linear Cryptanalysis via a Walsh-Transform Perspective - Jiahui He (COSIC)The theory...

23/02/2026

Heet van de naald en vers van de pers 📗📗

hot off the press

COSIC ESAT - Elektrotechniek Institutt for informatikk ved Universitetet i Bergen KU Leuven Prof. Vincent Rijmen Vincent Rijmen

09/02/2026

Interesse in een (extra) master of ma-na-ma opleiding? Bezoek KU Leuven op de Verderstudeerbeurs! Je ontdekt er al onze masters, schakelprogramma’s, manama’s, bijscholingen en veel meer.

📍 28 februari van 10-14u in de Universiteitshal

Schrijf je in: https://www.verderstudeerbeurs.be/leuven

06/02/2026

The job is done, also for us.

COSIC ESAT - Elektrotechniek KU Leuven